HITMAN

heres a video of an easy way of doing this achievement :)
hope it helps

To clear up any confusion you may have about the achievement:

Ballistic: Use a gun to kill a target (in the tutorial mission on the ship it forces you to kill the target with your gun so that already is counted).

Accident: In the ICA facility (the one where you have to eliminate Jasper Knight) an achievement requires you to kill Knight using the jet ejector seat. This counts as an accident kill.

Explosion: 'Nuff said. I cant remember if this was in a contract or the tutorial but one mission had me select between 2 opportunities (kill a single guard or blow up 3 mechanics). Well I chose to blow up the mechanics and cheevo popped. *Please note* You can always just eliminate ANY target using explosives instead of looking for an opportunity.

Thanks to neeker75 for letting us know that you can get these kills in custom contracts. According to neeker75: "An easy way to get an explosive kill is to create a contract in Paris. Swap out an item for a proximity mine. Once the mission begins, mark any person as target, and toss a mine near him/her. Once the explosion occurs, you'll get the credit for an explosive kill."

The following achievement's task of assassinating Jasper Knight with a sabotaged ejector seat should net you a ballistic and accidental kill.



The death was due to a projectile, the seat, and was conditioned to look accidental. For an explosive kill, go the the Freeform tutorial. A remote detonation device can be found in front of where you spawn along with some coins and a lock picking tool. Use it to net an explosive kill on your target. Once you have successfully performed all a ballistic, accidental and explosive assassination, you'll unlock the achievement.

The ballistic and accident ones are easily completed in the Final Test. The accident one can be received by doing either the ejector seat or the electrocution opportunity. The one with the slides and the electrocution is a bit easier. Just go outside once your target arrives and turn off the breaker. The general will come out and turn it back on.

The ballistic one can be done with just a little effort. Go around to the right and climb into the window behind the guard just past the generator that is past two leapt fences. Go through a couple of doors to the locker room and get the mechanic disguise. Fewer people will notice you. Now just go out the door here and up the stairs. Go to the room at the end of the balcony on your right. You should see a chessboard in there. You will want to subdue the guard and stash him in the bathroom trunk as he leaves the room. Wait until the general has gone, of course. Now just wait for the opportunity to shoot the target with your silenced weapon.

The explosive one is easily done in Freeform. Become Norlfolk and talk to the target. Knock him out in the office he takes you to and plant the explosive next to him. Now, just go upstairs to the helicopter and detonate. You can end the mission the moment you kill him.

I have made up a contract in Paris called 'tool'. Completing this with the optional eliminations will bag you this achievement

You are able to complete this doing only the tutorial missions. In the first training mission, the game forces you to get a ballistic (gun) kill, so that is out of the way. In "The Final Test" it also leads you to assassinate Jasper Knight using the ejector seat, counting as an accident kill. To get the explosive kill you should load up the contract tutorial mission and just work your way through normally. It will prompt you to blow up three mechanics with a propane canister, netting yourself the explosive kill, as well as the achievement, "The Creative Assasian" is you finish the mission.

Alternatively, you could also get the explosive kill by entering freeform training, dressing up as Norfolk, meeting with the target, knocking him out, planting the remote explosive next to him, and detonating it. This may also net you the "Unexpected Guest" achievement, but I am not sure. If you go this route you will also get the achievement "The Result of Previous Training" if you again finish the mission.